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  2. Optical mark recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_mark_recognition

    A response to an SAT math question marked on an optical answer sheet. An optical answer sheet or bubble sheet is a special type of form used in multiple choice question examinations. OMR is used to detect answers. The Scantron Corporation creates many optical answer sheets, although certain uses require their own customized system. [citation ...

  3. Bubble sheet - Wikipedia

    en.wikipedia.org/wiki/Bubble_sheet

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  4. What should you do if you’re still testing positive for COVID ...

    www.aol.com/news/still-testing-positive-covid-19...

    Most people will stop testing positive on a rapid antigen COVID-19 test within about 10 days, Cardona says. "Within 10 days after your initial positive test, you should convert back to negative ...

  5. Bio-secure bubble - Wikipedia

    en.wikipedia.org/wiki/Bio-secure_bubble

    The ESPN Wide World of Sports Complex has hosted several bubbles, including the NBA and Major League Soccer.. A bio-secure bubble, also known as a bubble, [1] or hub city, [2] [3] was a hosting arrangement for sporting events that emerged during the COVID-19 pandemic, under which events were held at a centralized site, often behind closed doors, with strict quarantine and safety protocols in ...

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  7. Contrast-enhanced ultrasound - Wikipedia

    en.wikipedia.org/wiki/Contrast-enhanced_ultrasound

    A bubble echocardiogram is an extension of this that uses simple air bubbles as a contrast medium during this study and often has to be requested specifically. Although colour Doppler can be used to detect abnormal flows between the chambers of the heart (e.g., persistent (patent) foramen ovale), it has a limited sensitivity. When specifically ...

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